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Zero of power series and Newton polygon in non-archimedean complete algebraically closed fields
In Gouvea book $p$-adic numbers, on can find this corollary (7.4.11)
Let $f(X) = 1+a_1X+a_2X^2+a_3X^3+\cdots$ be a power series which converges on the closed ball of radius $c = p^m$. Let $m_1, m_2, \...
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